Answer:
Grey and White Matter.
Explanation:
When looking at an image of trasnverse section of the spinal cord the grey matter is almost butterfly shapped and it has the central canal in the middle. The white matter is surrounding the butterfly shaped, grey matter.
OK the answer is B equals X squared
Although greenhouse gases such as water vapor, CO2, and methane naturally occur in smaller amounts, they absorb and release heat energy more efficiently than gases like N and O. (Nitrogen and Oxygen.)
So I would say (1) is the answer